电子束冷床炉熔铸钛合金锭表面裂纹形成原因分析
Surface crack analysis of the titanium alloy produced by electron beam cold hearth melting
许耀平 1肖永江 1梁高飞 2沈厚发3
作者信息
- 1. 云南钛业股份有限公司,云南楚雄 675000
- 2. 宝武特种冶金有限公司,上海 200940
- 3. 清华大学,北京 100084
- 折叠
摘要
电子束冷床炉(简称EB炉)熔铸技术在钛及钛合金圆锭、扁锭的制备中发挥重要作用,但是与纯钛熔铸相比,钛合金熔铸时容易出现严重的横裂纹.工程实际中发现结晶器内壁黏结物与凝固坯壳的连接是裂纹形成与扩展的主要原因.通过数值模拟及工程试验的方法分析确定了典型钛合金表面裂纹的形成机理及影响因素,并获得了凝固坯壳与拉锭速度及液面电子枪能量的关系,发现高拉速和持续拉锭的区域容易出现裂纹.
Abstract
Electron beam cold hearth melting plays an important role in the producing titanium and titanium alloys round or slab ingots.However,surface cracks were usually found in titanium alloy compared to pure titanium.In this work,the generation and propagation of the crack were analyzed.The results show that the upper shell is easy to stick on the mold and initiate the crack.A set of casting rate and electron beam power were employed to depict the shell evolution and melt pool profile by simulating the solidification process with slice model.According to these results,several methods were proposed to improve the ingot surface quality effectively.
关键词
电子束冷床炉熔炼技术/钛合金/表面裂纹/工艺优化Key words
EBCHM/titanium alloy/surface crack/process optimization引用本文复制引用
基金项目
国家重点研发计划项目(2022YFB3705602)
出版年
2024
NETL
NSTL
万方数据